1. What is the maximum file size of the PDF-document ( attached with several high resolution photographs) ?

2. What is the most reliable, cheapest and easiest way to protect PDF documents from piratism ( e.g. features built in the PDF document itself, watermarking etc. ) The problem is that more developed methods (DRM) are often expensive.

3. When the customer is downloading the PDF-document from your web site/home page (e.g. an E-book), how to protect the source folder on your server from hackers so that they are unable to download the document for free when knowing/seeing the path. Downloading should also happen immediately after the payment (of an E-book) without any delay (e.g. without sending emails or passwords back and forth between the seller and customer for security reasons). Which kind of software linked with PayPal system you prefer in order to reach the above mentioned goals?

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